Lightweight periclase-magnesium aluminate spinel refractory material and preparation method thereof

Abstract

The invention relates to a lightweight periclase-magnesium aluminate spinel refractory material and a preparation method thereof. The refractory material contains 14-21 wt% of porous periclase-magnesium aluminate spinel ceramic material particles with the particle size of 3-5 mm, 27-36 wt% of porous periclase-magnesium aluminate spinel ceramic material particles with the particle size being less than 3 mm and not less than 1 mm, 12-18 wt% of porous periclase-magnesium aluminate spinel ceramic material particles with the particle size of nano-apertures being less than 1 mm and not less than 0.1 mm as aggregates, contains 10-20 wt% of nano-aperture porous periclase-magnesium aluminate spinel ceramic material fine powder, 8-10 wt% of magnesium aluminate spinel fine powder and 10-20 wt% of magnesia fine powder as a matrix, and also contains 2-8 wt% of a binder. The preparation method comprises the following steps: placing the aggregates in a vacuum stirrer, carrying out vacuum pumping, adding the binder, stirring the aggregates and the binder, and stopping a vacuum pumping system; and adding the matrix, stirring the aggregates, the binder and the matrix, forming the obtained mixture, drying the formed mixture, keeping the temperature in a range of 1500-1650 DEG C for 3-8 h, and cooling the obtained mixture to obtain the lightweight periclase-magnesium aluminate spinel refractory material. The apertures of the lightweight periclase-magnesium aluminate spinel refractory material are nanometer level apertures, and the lightweight periclase-magnesium aluminate spinel refractory material has the advantages of low heat conduction coefficient, excellent thermal shock stability and strong erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of periclase-magnesium aluminum spinel refractory materials. In particular, it relates to a lightweight periclase-magnesia-aluminum spinel refractory material and a preparation method thereof. Background technique [0002] Periclase-magnesia-aluminum spinel refractory has excellent mechanical properties and high-temperature chemical stability, and is widely used in the upper transition zone and firing zone of cement rotary kilns. Due to its high density and high thermal conductivity, it is easy to The temperature of the rotary kiln cylinder is too high, resulting in a large amount of heat loss. Therefore, the development of lightweight periclase-magnesia-alumina-spinel refractories is an important way to reduce the thermal conductivity of the cement kiln lining. At the same time, with the development of modern industry and the acceleration of urbanization, a large amount of urban solid waste has caused seri...

AI Technical Summary

Problems solved by technology

For example, "a periclase-spinel lightweight refractory material and its preparation method" (ZL201610172527.1) patented technology, using magnesium oxide carbothermal reduction transport oxidation method to prepare lightweight periclase-spinel with different density gradients Spar refractory materials require strict atmospheric conditions during the preparation process. The prepared materials are dense on the surface and loose on the inside. Once the dense layer on the surface is damaged and the porous structure inside is in contact with the erosive medium, the material will be severely eroded and difficult to be used for replacement. fuel for cement rotary kiln

Another example is the patented technology of "Lightweight periclase-magnesia-alumina-spinel refractory material for cement rotary kiln and its preparation method" (ZL201410059476.2), which replaces dense magnesia aggregate with porous periclase-spinel aggregate , although the prepared lightweight periclase-magnesia-alumina-spinel refractory material has good thermal shock stability and high strength, it has large pore size, high air permeability, and poor corrosion resistance to saline-alkali and heavy metal oxides. Difficult to use in cement rotary kilns using alternative fuels